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Multiple mechanisms for integrating proprioceptive inputs that converge on the same motor pattern-generating network.

Gregory Barrière1, John Simmers, Denis Combes

  • 1Université de Bordeaux, Laboratoire Mouvement Adaptation Cognition, Unité Mixte de Recherche 5227, Centre National de la Recherche Scientifique, Bordeaux 33076, France.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 30, 2008
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Summary

Sensory feedback shapes motor programs. In lobsters, one proprioceptor (posterior stomach receptor) biases another

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Area of Science:

  • Neuroscience
  • Sensory Systems
  • Motor Control

Background:

  • Movement-derived sensory feedback is crucial for adapting motor programs.
  • Distinct proprioceptive systems can influence motor circuit output, but their integration is poorly understood.

Purpose of the Study:

  • To investigate the combined actions of two proprioceptors on the lobster gastric mill motor network.
  • To elucidate the integrative processes of convergent sensorimotor regulation.

Main Methods:

  • Studied two mechanoreceptors: anterior gastric receptor (AGR) and posterior stomach receptor (PSR).
  • Examined their effects on projection interneurons (commissural gastric - CG, and gastric inhibitor - GI) of the gastric circuit.
  • Investigated both short-term synaptic and long-lasting modulatory actions.

Main Results:

  • Mechanosensory information is integrated at postsynaptic and presynaptic levels.
  • PSR differentially affects AGR's input to CG and GI neurons.
  • PSR activation leads to prolonged changes in gastric circuit output via preferential GI neuron activation.

Conclusions:

  • Proprioceptive systems interact through complex presynaptic and postsynaptic mechanisms.
  • One proprioceptor can enhance its influence by modulating the access of another sensory system to the motor network.
  • This integration involves both rapid synaptic events and slower modulatory processes.